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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '450ececb38618b66e7a2c56ec20596850ef222143662c7e4af57bba2d5ef9f9f' 
  AND token = 'zKO3qmLKfaeQW2DUy0yAMacw4njku9CwwG14Gyhxyhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}